Reamer.



S A. COGSDILL.

REAMER.

APPLICATION FILED MAR.18, I916.

Patented Feb. 6, 1917.

ammo/whom ,Stz/art 605M522? warren an 1 STUART A. COGSDILL, OF DETROIT, MICHIGAN, ASSIGNOR T0 DETROIT REAMER SALVAGE C0,, OF DETROIT, MICHIGAN, A CORPORATIQN OF MICHIGAN.

REAIVEER.

To all whom it may concern:

Be it known that I, STUART A. Coesornn, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Reamers, of which the following isa specification, reference being had therein to the accompanying drawings.

The invention relates to reamers and more particularly to a construction in which the reaming shell is detachable from the shank.

The invention has among the objects thereof to provide a construction of reamer employing an expansible reaming shell by which the diameter of the expansible portion of the shell may be easily, quickly and accurately adjusted; to provide for rigidly clamping the expansible portions of the reaming shell in their adjusted position. Further, to provide a construction of reamer in which the centers are in permanent relation to each other.

Other objects of the invention will more fully hereinafter appear. The invention consists in the peculiar construction, arrangement and combination of parts as hereinafter set forth and as particularly pointed out in the claims.

In the drawings,Figure 1 is a perspective view of the device embodying the invention; Fig. 2 is an enlarged, longitudinal, central section; Fig. 3 is a section on the line ma2 of Fig. 2.

Referring to the construction shown in Figs. 1 to 3 inclusive, A designates the shank of the reamer, having the usual tapered spindle B, and C is the reaming shell provided with a central bore D snugly fitting the rear portion of the tapering spindle. The inner end of the shell is provided with diametrically opposed recesses E for engaging lugs F at the inner end of the spindle B. G is an integral collar upon the shank A against which the inner edge H of the shell abuts.

The shell C is formed with a plurality of slits I, three being shown in the construction illustrated in the drawings. These slits extend from the forward edge of the shell for a portion only of the length of the latter, the slits preferably being about half the length of the shell. The inner end of Specification of Letters Patent.

Application filed March 18, 1916.

Patented Feb. 6, 1917.

Serial No. 85,023.

the shell is therefore rigid. The blades or cutting edges a are also formed as a unitary part of the shell.

With a reamer it is very necessary to have the diameter of the cutting portions of the shell exceedingly accurate. The cutting portions however, wear down, and unless some means is provided for expanding the cutting portions of the shell, after it has become worn it cannot again be used for reaming openings having a diameter of the original diameter of the shell. construction embodying the invention the expansible portions of the shell not only permit adjusting the diameter of the cutting edges to a high degree of nicety, but also allow the cutting portions to be expanded after they have become worn, so as to restore their cutting edges to the original diameter.

Thus as illustrated, upon the end of the spindle B is a threaded stud J which is adapted to project beyond the shell. Upon the stud J is a nut K, the outer face L of which forms a seat for the inner face M of a projection M of the shell that extends beyond the blades. Preferably the face L is beveled, as shown, and also I find it dosirable to form the face M slightly beveled as indicated at N. Surrounding the projection M is a cup-shaped nut 0 having a threaded aperture P for engaging the stud With the J. The inner face Q, of the cup-shaped nut is also preferably beveled to engage the outer beveled face B of the projection M. By removing the nut O the nut K may be adjusted to effect a proper adjustment of the expansible portions, to obtain the desired diameter. into place the ends of the expansible portions will be tightly clamped between the two nuts. Since the base of the shell is an integral, unexpansible structure, and as the outer ends of the shell are rigidly clamped against play in any direction, the reamer is made as rigid as if it were formed of an unexpansible shell.

It is customary to provide the reamer with bearing portions or centers at opposite ends for engaging hearings on the lathe, and these bearings must be very accurately located. With the structure described, one center S for engaging the bearings of the When the nut O is turned lathe is formed in one end of the stud and the other center T is formed in the end U of the spindle. in permanent relation to each other and the adjustment of the nuts K and 0 does not afiect the relation of the centers S and T.

What I claim as my invention is 1. A reamer, comprising a shank, a shell detachably mounted upon the shank, said shell being provided with a plurality of slots extending from the forward end of the shell for a portion only of its length whereby the forward end of saidshell is expansible and its rear end unexpansible, and means engaging the forward end of the shell for securing the slotted portions against movement in any direction.

2. A reamer, comprising a shank, a shell detachably mounted upon the shank, said shell being provided with a plurality of slots extending from the forward end of the shell for a portion only of its length whereby the forward end of said shell is expansible, means adjustable upon the shank engaging the forward end of the shell for, expanding the latter, and means cooperating with the first-mentioned means for rigidly clamping the forward end of the shell against movement.

3. A reamer, comprising a shank having a spindle at one end thereof terminating in a threaded portion, a shellv upon said spindle, said shell detachably mounted being provided with a plurality of slots extending from the forward end thereof for a portion only of the length of the shell, whereby the forward end of the shell is expansible, a nut engaging said threaded portion arranged within the forward end of the shell, and a second nut also engaging said threaded portion surrounding the end of the shell and cooperating with said first-mentioned nut to rigidly clamp the forward end of the shell against movement.

4. A reamer, comprising a shank provided with a tapering spindle that terminates in a threaded stud, alined bearings respectively in one end of said shank and in the. end of said threaded stud, a shell engaging said spindle having an unexpansible inner end and provided with an expansible portionat the forward end of theshell, a nut engaging said threaded stud arranged within the forward end of the shell, and a cup-shaped nut engaging siad threadedstud and cooperating with the first-mentioned nut to rigidly The centers therefore are clamp the forward end of the shell against movement.

5. A reamer, comprising a shank provided with a spindle terminating at its forward end in a threaded stud, a shell having an unexpansible portion at its inner end and having the forward portion thereof expansible, there being a collar on said shank against which the innerend of said shell abuts, cooperating interlocking portions upon the collarand shell acting to hold the latter against rotation in relation'to the shank, a nut upon the threaded stud having apart arranged within the forward. end of the shell and adapted to expand thelatter, a cup-shaped nut engaging the threaded stud and surrounding the forward end of the shell, said nuts cooperating to clamp the forward end of the shell against. movement and acting to retain the inner end of the shell in engagement with said collar.

6. A reamer, comprising a shank, an ex pansible shell carried by the shank, and ad justable means for expanding the shell, said shank having. centers at opposite ends thereof in permanent relation to each other in all positions of adjustment of said means.

7. A reamer, comprising a shank provided with a spindleterminating at its forward end in a threaded portion, an expansible shell carried by the shank and surrounding said spindle, and expanding nuts upon the threaded portion of the spindle for' securing the forward ends of the shell in their adjusted position, a center being,

formed at the endof said spindle, and acooperating center being provided at the other end of said spindle.

8-. A reamer, comprising a shank, a shell.

In testimony whereof I affix my signature in presence of two witnesses.

STUART A. COGSDI'LL.

Witnesses:

l/VM. J. BELKNAP, PHYLLIS CoBURN.

Copies of this patent may be obtained. for fivecents each, by addressing the Commissioner of Patents, wash ington', I). G. 

